PROJECT

New Connections in Hong Kong

Bouygues subsidiary Dragages Hong Kong is building the new two-tube motorway tunnel that is part of the new border crosspoint Liantang/ Heung Yuen Wai project between Hong Kong and China. Once completed, the tunnel will be Hong Kong’s longest road tunnel.

A two-lane main connecting motorway running through the 4.8 km long Liantang tunnel leads from the Fanling intersection to the new Sha Tau Kok interchange. Administrative buildings and ventilation facilities are part of the ambitious building project.

Single-sided climbing under extreme conditions

MEVA engineers faced a big challenge on the gravity walls leading to the entrance of the tunnel: For reasons of speed, these were to be climbed. Climbing 14 m high walls and anchoring into bedrock proved to be the really tricky part. The rail-guided climbing system MGC was modified to cater for this single-sided approach, including a unique anchoring and bracketing technique to handle the exceptional pressures of fast, high concrete pours. That solved, the next challenge was to integrate the safety and speed of railguided climbing with the constraints of single-sided pours and, in addition, enable the formwork on the climbing platforms to be moved back and forth by carriage. The Mammut 350 wall formwork’s load capacity of 100 kN/m² allows for any pour speed up to a height of 4 m regardless of concrete type and temperature when used on double-sided walls. Here, the strength of the Mammut 350 system allows Dragages to cast up to 3 m high singlesided pours

MEVA STB 450 offers flexible solution for narrow, inclined rail section: Near the municipality of Gretzenbach, the four-track route branches into two separate lines. Here, the two southern tracks gradually descend and pass below the cantonal road before entering the new Eppenberg Tunnel.